thanks for your help.
I'm not surprised that you don't see this problem with your Pioneer DVR-108. On another machine I have an Asus 1604P which is a clone of the Pioneer DVR-108. I don't have the problem with the Asus 1604P.
If someone on the board has either a Pioneer DVR-109 or an Asus 1608P, I would very much appreciate it if they would try to do a Format with Verify and report their results.